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The key here is the behavior of AWS AMIs in the context of ECS. By default the AWS ECS Amazon Linux AMI optimized for ECS is in charge of VOLUME management but there's a problem if you copy that AMI and try to launch a new instance, the SECONDARY volume that ECS uses to deploy docker on can go missing.
Troubleshooting steps.
Check /var/log/cloud-init-...
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Both are excellent tools, but it depends on your use cases for which is better. I would highly recommend using the entire AWS Ci/Cd suite (CodeBuild/CodePipeline/CodeDeploy) to gain the full benefit of using your resources in AWS. Here are pros for both:
Jenkins
Multitude of customizability plugins
Integration with all cloud providers (GCP, Azure, etc.)
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